From 9 to 12 hallmarks of aging: a plain-language guide
The original nine hallmarks of aging became twelve in the widely used 2023 framework, adding impaired cellular recycling, chronic inflammation and dysbiosis. This plain-language guide explains the list—from DNA and telomeres to mitochondria and senescent cells—and how Healthy Longevity Clinic connects biological mechanisms with useful health decisions.
The hallmarks of aging are a framework for describing biological processes involved in aging. The original 2013 paper proposed nine. A widely used 2023 update expanded the framework to twelve. If you remember reading about the “nine hallmarks of aging,” you have the earlier version—not a different kind of aging. 1 2
The framework helps researchers organize a complicated subject. For a reader, its value is understanding why very different treatments can all be described as “targeting aging”—and why that phrase alone tells you little about their practical benefit.
The original nine, in everyday language
Genomic instability: damage accumulates in DNA.
Telomere attrition: protective chromosome ends shorten.
Epigenetic alterations: patterns controlling gene activity change.
Loss of proteostasis: protein maintenance becomes less effective.
Deregulated nutrient sensing: cells’ responses to available nutrients change.
Mitochondrial dysfunction: cellular energy systems work less effectively.
Cellular senescence: some cells persist after stopping division.
Stem-cell exhaustion: tissue-renewal capacity declines.
Altered intercellular communication: signaling between cells changes. 1
What the 2023 update added
Disabled macroautophagy: a cellular recycling process becomes less effective.
Chronic inflammation: inflammatory activity remains elevated over time.
Dysbiosis: changes in microbial communities can disturb their relationship with the host. 2
These are connected processes, not twelve isolated diagnoses. The list is a scientific model that can develop as research advances. It is not a checklist from which every person needs twelve laboratory tests or twelve treatments.
How to read a claim that a treatment “targets aging”
Start by separating three questions:
What process does it affect? This is the biological explanation.
What happened in people? This concerns results in a particular population, at a particular dose and duration.
Would the result matter to me? This connects the study with your health, symptoms, abilities and alternatives.
A company may have a convincing answer to the first question while the second is still being studied. That can make the work scientifically interesting without making the treatment an appropriate next step for every reader.
For example, “supports mitochondria” is incomplete unless you know what was measured. Did a laboratory signal change? Did participants walk farther or recover better? Was the result found in healthy adults, people with a specific disease or only in an experimental model? Those details determine what the claim can reasonably mean.
Why one attractive number is not the whole result
Imagine that an intervention changes a molecular measurement but produces no noticeable change in the ability you hoped to improve. The molecular finding may help research move forward, yet it leaves your original question unanswered.
Now imagine that a well-designed plan improves blood pressure, strength or the ability to sustain activity. Those results can be valuable without assigning each improvement to a single hallmark. The framework explains biology; the care plan still needs outcomes meaningful to the person.
This also helps put new technologies in perspective. An advanced test may generate a detailed picture. Its clinical usefulness depends on whether the information helps choose, adjust or stop an action.
How Healthy Longevity Clinic experts evaluate the evidence
At Healthy Longevity Clinic, the hallmarks help us understand what a new treatment is trying to change. We then connect that mechanism to a patient question: better energy, preserved mobility, improved metabolic health or lower risk of a particular disease.
Our reading of a study considers who participated, what the comparison group received, which outcomes improved and what unwanted effects occurred. We also ask whether the outcome is large enough to make a practical difference. A statistically detectable change and a meaningful improvement are not always the same.
For you, the useful result is a clearer explanation of why an option belongs in your plan. “It addresses a hallmark” is a starting point for that discussion, not its conclusion.
What should I do with this information?
Use the framework to ask better questions, not to diagnose yourself. When you encounter an anti-aging claim, ask which human result supports it and whether that result matches your goal.
If your priority is climbing stairs comfortably, sleeping well or staying focused, start there. A longevity plan earns its value by helping you preserve or improve those abilities now while addressing future health risks. The biology matters most when it helps make that plan more effective.
What remains uncertain
The hallmarks are an evolving research framework, not an individual diagnostic checklist. Affecting a biological process does not establish the size or relevance of a clinical benefit.
References
- López-Otín et al.: The Hallmarks of Aging · 2013 · Checked 2026-09-28
- López-Otín et al.: Hallmarks of Aging—An Expanding Universe · 2023 · Checked 2026-09-28
Disclosure
Produced for Healthy Longevity Clinic by its editorial team with AI assistance. The Clinic has a commercial interest in its services. Educational information does not replace an individual assessment.